<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>关于let</title>
</head>

<body>

</body>
<script>
    let name = 'tom'
    while (true) {
        let name = 'jerry'
        console.log(name);//jerry
        break
    }
    console.log(name);//tom
</script>

</html>